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ISBN-10: 0120121212

ISBN-13: 9780120121212

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26× series of standards. 264 (also known as Advanced Video Coding) are standards for the coded representation of visual information. Each standard is a document that primarily defines two things, a coded representation (or syntax) that describes visual data in a compressed form and a method of decoding the syntax to reconstruct visual information. Each standard aims to ensure that compliant encoders and decoders can successfully interwork with each other, whilst allowing manufacturers the freedom to develop competitive and innovative products.

Lossy compression is necessary to achieve higher compression. In a lossy compression system, the decompressed data is not identical to the source data and much higher compression ratios can be achieved at the expense of a loss of visual quality. Lossy video compression systems are based on the principle of removing subjective redundancy, elements of the image or video sequence that can be removed without significantly affecting the viewer’s perception of visual quality. 264 and MPEG-4 Video Compression: Video Coding for Next-generation Multimedia.

The transform converts the samples into another domain in which they are represented by transform coefficients. The coefficients are quantised to remove insignificant values, leaving a small number of significant coefficients that provide a more compact representation of the residual frame. The output of the spatial model is a set of quantised transform coefficients. The parameters of the temporal model (typically motion vectors) and the spatial model (coefficients) are compressed by the entropy encoder.

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Advances in Computers, Vol. 21

by Charles

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